The Post reports Sunday that criminal charges are possible if investigators determine that the wildfire was started by an untended fire pit. The newspaper attributes the information to a senior law enforcement official familiar with the investigation. The newspaper did not name the official.

Boulder Sheriff Joe Pelle previously said investigators initially believed the fire was started by a vehicle that crashed into a propane tank.

The wildfire that began Sept. 6 has cost more than $6.7 million to fight and destroyed 169 homes, making it one of the most damaging fires in Colorado history.